124 строки
2.9 KiB
C
124 строки
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
|
|
/*
|
|
* Copyright (C) Nokia Corporation
|
|
*
|
|
* Written by Timo Kokkonen <timo.t.kokkonen at nokia.com>
|
|
*/
|
|
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mod_devicetable.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/mfd/twl.h>
|
|
|
|
#define TWL4030_WATCHDOG_CFG_REG_OFFS 0x3
|
|
|
|
static bool nowayout = WATCHDOG_NOWAYOUT;
|
|
module_param(nowayout, bool, 0);
|
|
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started "
|
|
"(default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
|
|
|
static int twl4030_wdt_write(unsigned char val)
|
|
{
|
|
return twl_i2c_write_u8(TWL_MODULE_PM_RECEIVER, val,
|
|
TWL4030_WATCHDOG_CFG_REG_OFFS);
|
|
}
|
|
|
|
static int twl4030_wdt_start(struct watchdog_device *wdt)
|
|
{
|
|
return twl4030_wdt_write(wdt->timeout + 1);
|
|
}
|
|
|
|
static int twl4030_wdt_stop(struct watchdog_device *wdt)
|
|
{
|
|
return twl4030_wdt_write(0);
|
|
}
|
|
|
|
static int twl4030_wdt_set_timeout(struct watchdog_device *wdt,
|
|
unsigned int timeout)
|
|
{
|
|
wdt->timeout = timeout;
|
|
return 0;
|
|
}
|
|
|
|
static const struct watchdog_info twl4030_wdt_info = {
|
|
.options = WDIOF_SETTIMEOUT | WDIOF_MAGICCLOSE | WDIOF_KEEPALIVEPING,
|
|
.identity = "TWL4030 Watchdog",
|
|
};
|
|
|
|
static const struct watchdog_ops twl4030_wdt_ops = {
|
|
.owner = THIS_MODULE,
|
|
.start = twl4030_wdt_start,
|
|
.stop = twl4030_wdt_stop,
|
|
.set_timeout = twl4030_wdt_set_timeout,
|
|
};
|
|
|
|
static int twl4030_wdt_probe(struct platform_device *pdev)
|
|
{
|
|
struct device *dev = &pdev->dev;
|
|
struct watchdog_device *wdt;
|
|
|
|
wdt = devm_kzalloc(dev, sizeof(*wdt), GFP_KERNEL);
|
|
if (!wdt)
|
|
return -ENOMEM;
|
|
|
|
wdt->info = &twl4030_wdt_info;
|
|
wdt->ops = &twl4030_wdt_ops;
|
|
wdt->status = 0;
|
|
wdt->timeout = 30;
|
|
wdt->min_timeout = 1;
|
|
wdt->max_timeout = 30;
|
|
wdt->parent = dev;
|
|
|
|
watchdog_set_nowayout(wdt, nowayout);
|
|
platform_set_drvdata(pdev, wdt);
|
|
|
|
twl4030_wdt_stop(wdt);
|
|
|
|
return devm_watchdog_register_device(dev, wdt);
|
|
}
|
|
|
|
static int twl4030_wdt_suspend(struct platform_device *pdev, pm_message_t state)
|
|
{
|
|
struct watchdog_device *wdt = platform_get_drvdata(pdev);
|
|
if (watchdog_active(wdt))
|
|
return twl4030_wdt_stop(wdt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int twl4030_wdt_resume(struct platform_device *pdev)
|
|
{
|
|
struct watchdog_device *wdt = platform_get_drvdata(pdev);
|
|
if (watchdog_active(wdt))
|
|
return twl4030_wdt_start(wdt);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct of_device_id twl_wdt_of_match[] = {
|
|
{ .compatible = "ti,twl4030-wdt", },
|
|
{ },
|
|
};
|
|
MODULE_DEVICE_TABLE(of, twl_wdt_of_match);
|
|
|
|
static struct platform_driver twl4030_wdt_driver = {
|
|
.probe = twl4030_wdt_probe,
|
|
.suspend = pm_ptr(twl4030_wdt_suspend),
|
|
.resume = pm_ptr(twl4030_wdt_resume),
|
|
.driver = {
|
|
.name = "twl4030_wdt",
|
|
.of_match_table = twl_wdt_of_match,
|
|
},
|
|
};
|
|
|
|
module_platform_driver(twl4030_wdt_driver);
|
|
|
|
MODULE_AUTHOR("Nokia Corporation");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS("platform:twl4030_wdt");
|
|
|